1. Department of Family and Community Medicine, University of California, San Francisco
2. Division of Hospital Medicine, Department of Medicine, University of California, San Francisco
3. Quantitative Sciences Unit, Department of Medicine, Stanford University, Stanford, California
4. Division of HIV, Infectious Diseases & Global Medicine, San Francisco General Hospital, San Francisco, California
5. Department of Epidemiology and Biostatistics, University of California, San Francisco
6. Division of Infectious Diseases, Department of Medicine, University of California, San Francisco
7. Division of Infectious Diseases and Geographic Medicine, Stanford University School of Medicine, Stanford, California